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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ST OHCI driver
4 *
5 * Copyright (C) 2014 STMicroelectronics – All Rights Reserved
6 *
7 * Author: Peter Griffin <peter.griffin@linaro.org>
8 *
9 * Derived from ohci-platform.c
10 */
11
12#include <linux/clk.h>
13#include <linux/dma-mapping.h>
14#include <linux/hrtimer.h>
15#include <linux/io.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/err.h>
19#include <linux/phy/phy.h>
20#include <linux/platform_device.h>
21#include <linux/reset.h>
22#include <linux/usb/ohci_pdriver.h>
23#include <linux/usb.h>
24#include <linux/usb/hcd.h>
25
26#include "ohci.h"
27
28#define USB_MAX_CLKS 3
29
30struct st_ohci_platform_priv {
31 struct clk *clks[USB_MAX_CLKS];
32 struct clk *clk48;
33 struct reset_control *rst;
34 struct reset_control *pwr;
35 struct phy *phy;
36};
37
38#define DRIVER_DESC "OHCI STMicroelectronics driver"
39
40#define hcd_to_ohci_priv(h) \
41 ((struct st_ohci_platform_priv *)hcd_to_ohci(h)->priv)
42
43static int st_ohci_platform_power_on(struct platform_device *dev)
44{
45 struct usb_hcd *hcd = platform_get_drvdata(dev);
46 struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
47 int clk, ret;
48
49 ret = reset_control_deassert(priv->pwr);
50 if (ret)
51 return ret;
52
53 ret = reset_control_deassert(priv->rst);
54 if (ret)
55 goto err_assert_power;
56
57 /* some SoCs don't have a dedicated 48Mhz clock, but those that do
58 need the rate to be explicitly set */
59 if (priv->clk48) {
60 ret = clk_set_rate(priv->clk48, 48000000);
61 if (ret)
62 goto err_assert_reset;
63 }
64
65 for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) {
66 ret = clk_prepare_enable(priv->clks[clk]);
67 if (ret)
68 goto err_disable_clks;
69 }
70
71 ret = phy_init(priv->phy);
72 if (ret)
73 goto err_disable_clks;
74
75 ret = phy_power_on(priv->phy);
76 if (ret)
77 goto err_exit_phy;
78
79 return 0;
80
81err_exit_phy:
82 phy_exit(priv->phy);
83err_disable_clks:
84 while (--clk >= 0)
85 clk_disable_unprepare(priv->clks[clk]);
86err_assert_reset:
87 reset_control_assert(priv->rst);
88err_assert_power:
89 reset_control_assert(priv->pwr);
90
91 return ret;
92}
93
94static void st_ohci_platform_power_off(struct platform_device *dev)
95{
96 struct usb_hcd *hcd = platform_get_drvdata(dev);
97 struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
98
99 int clk;
100
101 reset_control_assert(priv->pwr);
102
103 reset_control_assert(priv->rst);
104
105 phy_power_off(priv->phy);
106
107 phy_exit(priv->phy);
108
109 for (clk = USB_MAX_CLKS - 1; clk >= 0; clk--)
110 if (priv->clks[clk])
111 clk_disable_unprepare(priv->clks[clk]);
112}
113
114static struct hc_driver __read_mostly ohci_platform_hc_driver;
115
116static const struct ohci_driver_overrides platform_overrides __initconst = {
117 .product_desc = "ST OHCI controller",
118 .extra_priv_size = sizeof(struct st_ohci_platform_priv),
119};
120
121static struct usb_ohci_pdata ohci_platform_defaults = {
122 .power_on = st_ohci_platform_power_on,
123 .power_suspend = st_ohci_platform_power_off,
124 .power_off = st_ohci_platform_power_off,
125};
126
127static int st_ohci_platform_probe(struct platform_device *dev)
128{
129 struct usb_hcd *hcd;
130 struct resource *res_mem;
131 struct usb_ohci_pdata *pdata = &ohci_platform_defaults;
132 struct st_ohci_platform_priv *priv;
133 int err, irq, clk = 0;
134
135 if (usb_disabled())
136 return -ENODEV;
137
138 irq = platform_get_irq(dev, 0);
139 if (irq < 0)
140 return irq;
141
142 hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
143 dev_name(&dev->dev));
144 if (!hcd)
145 return -ENOMEM;
146
147 platform_set_drvdata(dev, hcd);
148 dev->dev.platform_data = pdata;
149 priv = hcd_to_ohci_priv(hcd);
150
151 priv->phy = devm_phy_get(&dev->dev, "usb");
152 if (IS_ERR(priv->phy)) {
153 err = PTR_ERR(priv->phy);
154 goto err_put_hcd;
155 }
156
157 for (clk = 0; clk < USB_MAX_CLKS; clk++) {
158 priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
159 if (IS_ERR(priv->clks[clk])) {
160 err = PTR_ERR(priv->clks[clk]);
161 if (err == -EPROBE_DEFER)
162 goto err_put_clks;
163 priv->clks[clk] = NULL;
164 break;
165 }
166 }
167
168 /* some SoCs don't have a dedicated 48Mhz clock, but those that
169 do need the rate to be explicitly set */
170 priv->clk48 = devm_clk_get(&dev->dev, "clk48");
171 if (IS_ERR(priv->clk48)) {
172 dev_info(&dev->dev, "48MHz clk not found\n");
173 priv->clk48 = NULL;
174 }
175
176 priv->pwr =
177 devm_reset_control_get_optional_shared(&dev->dev, "power");
178 if (IS_ERR(priv->pwr)) {
179 err = PTR_ERR(priv->pwr);
180 goto err_put_clks;
181 }
182
183 priv->rst =
184 devm_reset_control_get_optional_shared(&dev->dev, "softreset");
185 if (IS_ERR(priv->rst)) {
186 err = PTR_ERR(priv->rst);
187 goto err_put_clks;
188 }
189
190 if (pdata->power_on) {
191 err = pdata->power_on(dev);
192 if (err < 0)
193 goto err_power;
194 }
195
196 hcd->regs = devm_platform_get_and_ioremap_resource(dev, 0, &res_mem);
197 if (IS_ERR(hcd->regs)) {
198 err = PTR_ERR(hcd->regs);
199 goto err_power;
200 }
201 hcd->rsrc_start = res_mem->start;
202 hcd->rsrc_len = resource_size(res_mem);
203
204 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
205 if (err)
206 goto err_power;
207
208 device_wakeup_enable(hcd->self.controller);
209
210 platform_set_drvdata(dev, hcd);
211
212 return err;
213
214err_power:
215 if (pdata->power_off)
216 pdata->power_off(dev);
217
218err_put_clks:
219 while (--clk >= 0)
220 clk_put(priv->clks[clk]);
221err_put_hcd:
222 if (pdata == &ohci_platform_defaults)
223 dev->dev.platform_data = NULL;
224
225 usb_put_hcd(hcd);
226
227 return err;
228}
229
230static void st_ohci_platform_remove(struct platform_device *dev)
231{
232 struct usb_hcd *hcd = platform_get_drvdata(dev);
233 struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
234 struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
235 int clk;
236
237 usb_remove_hcd(hcd);
238
239 if (pdata->power_off)
240 pdata->power_off(dev);
241
242
243 for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++)
244 clk_put(priv->clks[clk]);
245
246 usb_put_hcd(hcd);
247
248 if (pdata == &ohci_platform_defaults)
249 dev->dev.platform_data = NULL;
250}
251
252#ifdef CONFIG_PM_SLEEP
253
254static int st_ohci_suspend(struct device *dev)
255{
256 struct usb_hcd *hcd = dev_get_drvdata(dev);
257 struct usb_ohci_pdata *pdata = dev->platform_data;
258 struct platform_device *pdev = to_platform_device(dev);
259 bool do_wakeup = device_may_wakeup(dev);
260 int ret;
261
262 ret = ohci_suspend(hcd, do_wakeup);
263 if (ret)
264 return ret;
265
266 if (pdata->power_suspend)
267 pdata->power_suspend(pdev);
268
269 return ret;
270}
271
272static int st_ohci_resume(struct device *dev)
273{
274 struct usb_hcd *hcd = dev_get_drvdata(dev);
275 struct usb_ohci_pdata *pdata = dev_get_platdata(dev);
276 struct platform_device *pdev = to_platform_device(dev);
277 int err;
278
279 if (pdata->power_on) {
280 err = pdata->power_on(pdev);
281 if (err < 0)
282 return err;
283 }
284
285 ohci_resume(hcd, false);
286 return 0;
287}
288
289static SIMPLE_DEV_PM_OPS(st_ohci_pm_ops, st_ohci_suspend, st_ohci_resume);
290
291#endif /* CONFIG_PM_SLEEP */
292
293static const struct of_device_id st_ohci_platform_ids[] = {
294 { .compatible = "st,st-ohci-300x", },
295 { /* sentinel */ }
296};
297MODULE_DEVICE_TABLE(of, st_ohci_platform_ids);
298
299static struct platform_driver ohci_platform_driver = {
300 .probe = st_ohci_platform_probe,
301 .remove_new = st_ohci_platform_remove,
302 .shutdown = usb_hcd_platform_shutdown,
303 .driver = {
304 .name = "st-ohci",
305#ifdef CONFIG_PM_SLEEP
306 .pm = &st_ohci_pm_ops,
307#endif
308 .of_match_table = st_ohci_platform_ids,
309 }
310};
311
312static int __init ohci_platform_init(void)
313{
314 if (usb_disabled())
315 return -ENODEV;
316
317 ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides);
318 return platform_driver_register(&ohci_platform_driver);
319}
320module_init(ohci_platform_init);
321
322static void __exit ohci_platform_cleanup(void)
323{
324 platform_driver_unregister(&ohci_platform_driver);
325}
326module_exit(ohci_platform_cleanup);
327
328MODULE_DESCRIPTION(DRIVER_DESC);
329MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>");
330MODULE_LICENSE("GPL");
1/*
2 * ST OHCI driver
3 *
4 * Copyright (C) 2014 STMicroelectronics – All Rights Reserved
5 *
6 * Author: Peter Griffin <peter.griffin@linaro.org>
7 *
8 * Derived from ohci-platform.c
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15#include <linux/clk.h>
16#include <linux/dma-mapping.h>
17#include <linux/hrtimer.h>
18#include <linux/io.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/err.h>
22#include <linux/phy/phy.h>
23#include <linux/platform_device.h>
24#include <linux/reset.h>
25#include <linux/usb/ohci_pdriver.h>
26#include <linux/usb.h>
27#include <linux/usb/hcd.h>
28
29#include "ohci.h"
30
31#define USB_MAX_CLKS 3
32
33struct st_ohci_platform_priv {
34 struct clk *clks[USB_MAX_CLKS];
35 struct clk *clk48;
36 struct reset_control *rst;
37 struct reset_control *pwr;
38 struct phy *phy;
39};
40
41#define DRIVER_DESC "OHCI STMicroelectronics driver"
42
43#define hcd_to_ohci_priv(h) \
44 ((struct st_ohci_platform_priv *)hcd_to_ohci(h)->priv)
45
46static const char hcd_name[] = "ohci-st";
47
48static int st_ohci_platform_power_on(struct platform_device *dev)
49{
50 struct usb_hcd *hcd = platform_get_drvdata(dev);
51 struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
52 int clk, ret;
53
54 ret = reset_control_deassert(priv->pwr);
55 if (ret)
56 return ret;
57
58 ret = reset_control_deassert(priv->rst);
59 if (ret)
60 goto err_assert_power;
61
62 /* some SoCs don't have a dedicated 48Mhz clock, but those that do
63 need the rate to be explicitly set */
64 if (priv->clk48) {
65 ret = clk_set_rate(priv->clk48, 48000000);
66 if (ret)
67 goto err_assert_reset;
68 }
69
70 for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) {
71 ret = clk_prepare_enable(priv->clks[clk]);
72 if (ret)
73 goto err_disable_clks;
74 }
75
76 ret = phy_init(priv->phy);
77 if (ret)
78 goto err_disable_clks;
79
80 ret = phy_power_on(priv->phy);
81 if (ret)
82 goto err_exit_phy;
83
84 return 0;
85
86err_exit_phy:
87 phy_exit(priv->phy);
88err_disable_clks:
89 while (--clk >= 0)
90 clk_disable_unprepare(priv->clks[clk]);
91err_assert_reset:
92 reset_control_assert(priv->rst);
93err_assert_power:
94 reset_control_assert(priv->pwr);
95
96 return ret;
97}
98
99static void st_ohci_platform_power_off(struct platform_device *dev)
100{
101 struct usb_hcd *hcd = platform_get_drvdata(dev);
102 struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
103
104 int clk;
105
106 reset_control_assert(priv->pwr);
107
108 reset_control_assert(priv->rst);
109
110 phy_power_off(priv->phy);
111
112 phy_exit(priv->phy);
113
114 for (clk = USB_MAX_CLKS - 1; clk >= 0; clk--)
115 if (priv->clks[clk])
116 clk_disable_unprepare(priv->clks[clk]);
117}
118
119static struct hc_driver __read_mostly ohci_platform_hc_driver;
120
121static const struct ohci_driver_overrides platform_overrides __initconst = {
122 .product_desc = "ST OHCI controller",
123 .extra_priv_size = sizeof(struct st_ohci_platform_priv),
124};
125
126static struct usb_ohci_pdata ohci_platform_defaults = {
127 .power_on = st_ohci_platform_power_on,
128 .power_suspend = st_ohci_platform_power_off,
129 .power_off = st_ohci_platform_power_off,
130};
131
132static int st_ohci_platform_probe(struct platform_device *dev)
133{
134 struct usb_hcd *hcd;
135 struct resource *res_mem;
136 struct usb_ohci_pdata *pdata = &ohci_platform_defaults;
137 struct st_ohci_platform_priv *priv;
138 struct ohci_hcd *ohci;
139 int err, irq, clk = 0;
140
141 if (usb_disabled())
142 return -ENODEV;
143
144 irq = platform_get_irq(dev, 0);
145 if (irq < 0) {
146 dev_err(&dev->dev, "no irq provided");
147 return irq;
148 }
149
150 res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
151 if (!res_mem) {
152 dev_err(&dev->dev, "no memory resource provided");
153 return -ENXIO;
154 }
155
156 hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
157 dev_name(&dev->dev));
158 if (!hcd)
159 return -ENOMEM;
160
161 platform_set_drvdata(dev, hcd);
162 dev->dev.platform_data = pdata;
163 priv = hcd_to_ohci_priv(hcd);
164 ohci = hcd_to_ohci(hcd);
165
166 priv->phy = devm_phy_get(&dev->dev, "usb");
167 if (IS_ERR(priv->phy)) {
168 err = PTR_ERR(priv->phy);
169 goto err_put_hcd;
170 }
171
172 for (clk = 0; clk < USB_MAX_CLKS; clk++) {
173 priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
174 if (IS_ERR(priv->clks[clk])) {
175 err = PTR_ERR(priv->clks[clk]);
176 if (err == -EPROBE_DEFER)
177 goto err_put_clks;
178 priv->clks[clk] = NULL;
179 break;
180 }
181 }
182
183 /* some SoCs don't have a dedicated 48Mhz clock, but those that
184 do need the rate to be explicitly set */
185 priv->clk48 = devm_clk_get(&dev->dev, "clk48");
186 if (IS_ERR(priv->clk48)) {
187 dev_info(&dev->dev, "48MHz clk not found\n");
188 priv->clk48 = NULL;
189 }
190
191 priv->pwr = devm_reset_control_get_optional(&dev->dev, "power");
192 if (IS_ERR(priv->pwr)) {
193 err = PTR_ERR(priv->pwr);
194 goto err_put_clks;
195 }
196
197 priv->rst = devm_reset_control_get_optional(&dev->dev, "softreset");
198 if (IS_ERR(priv->rst)) {
199 err = PTR_ERR(priv->rst);
200 goto err_put_clks;
201 }
202
203 if (pdata->power_on) {
204 err = pdata->power_on(dev);
205 if (err < 0)
206 goto err_power;
207 }
208
209 hcd->rsrc_start = res_mem->start;
210 hcd->rsrc_len = resource_size(res_mem);
211
212 hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
213 if (IS_ERR(hcd->regs)) {
214 err = PTR_ERR(hcd->regs);
215 goto err_power;
216 }
217 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
218 if (err)
219 goto err_power;
220
221 device_wakeup_enable(hcd->self.controller);
222
223 platform_set_drvdata(dev, hcd);
224
225 return err;
226
227err_power:
228 if (pdata->power_off)
229 pdata->power_off(dev);
230
231err_put_clks:
232 while (--clk >= 0)
233 clk_put(priv->clks[clk]);
234err_put_hcd:
235 if (pdata == &ohci_platform_defaults)
236 dev->dev.platform_data = NULL;
237
238 usb_put_hcd(hcd);
239
240 return err;
241}
242
243static int st_ohci_platform_remove(struct platform_device *dev)
244{
245 struct usb_hcd *hcd = platform_get_drvdata(dev);
246 struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
247 struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
248 int clk;
249
250 usb_remove_hcd(hcd);
251
252 if (pdata->power_off)
253 pdata->power_off(dev);
254
255
256 for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++)
257 clk_put(priv->clks[clk]);
258
259 usb_put_hcd(hcd);
260
261 if (pdata == &ohci_platform_defaults)
262 dev->dev.platform_data = NULL;
263
264 return 0;
265}
266
267#ifdef CONFIG_PM_SLEEP
268
269static int st_ohci_suspend(struct device *dev)
270{
271 struct usb_hcd *hcd = dev_get_drvdata(dev);
272 struct usb_ohci_pdata *pdata = dev->platform_data;
273 struct platform_device *pdev = to_platform_device(dev);
274 bool do_wakeup = device_may_wakeup(dev);
275 int ret;
276
277 ret = ohci_suspend(hcd, do_wakeup);
278 if (ret)
279 return ret;
280
281 if (pdata->power_suspend)
282 pdata->power_suspend(pdev);
283
284 return ret;
285}
286
287static int st_ohci_resume(struct device *dev)
288{
289 struct usb_hcd *hcd = dev_get_drvdata(dev);
290 struct usb_ohci_pdata *pdata = dev_get_platdata(dev);
291 struct platform_device *pdev = to_platform_device(dev);
292 int err;
293
294 if (pdata->power_on) {
295 err = pdata->power_on(pdev);
296 if (err < 0)
297 return err;
298 }
299
300 ohci_resume(hcd, false);
301 return 0;
302}
303
304static SIMPLE_DEV_PM_OPS(st_ohci_pm_ops, st_ohci_suspend, st_ohci_resume);
305
306#endif /* CONFIG_PM_SLEEP */
307
308static const struct of_device_id st_ohci_platform_ids[] = {
309 { .compatible = "st,st-ohci-300x", },
310 { /* sentinel */ }
311};
312MODULE_DEVICE_TABLE(of, st_ohci_platform_ids);
313
314static struct platform_driver ohci_platform_driver = {
315 .probe = st_ohci_platform_probe,
316 .remove = st_ohci_platform_remove,
317 .shutdown = usb_hcd_platform_shutdown,
318 .driver = {
319 .name = "st-ohci",
320#ifdef CONFIG_PM_SLEEP
321 .pm = &st_ohci_pm_ops,
322#endif
323 .of_match_table = st_ohci_platform_ids,
324 }
325};
326
327static int __init ohci_platform_init(void)
328{
329 if (usb_disabled())
330 return -ENODEV;
331
332 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
333
334 ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides);
335 return platform_driver_register(&ohci_platform_driver);
336}
337module_init(ohci_platform_init);
338
339static void __exit ohci_platform_cleanup(void)
340{
341 platform_driver_unregister(&ohci_platform_driver);
342}
343module_exit(ohci_platform_cleanup);
344
345MODULE_DESCRIPTION(DRIVER_DESC);
346MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>");
347MODULE_LICENSE("GPL");